Beyonce sings the national anthem during ceremonial swearing-in at 57th Presidential Inauguration ceremony for US President Obama, Washington DC. (AP Photo)

Biden's-hand

Hand of US Vice President Joe Biden rests on a family bible as he takes the oath of office for a second term, with wife Jill holding bible, during 2013 inauguration swearing-in ceremony, US Naval Observatory, Washington, DC (AP Photo)

Barack Obama, as US President (l), takes the official oath of office for a second term, with first lady Michelle Obama holding the Robinson family Bible, Blue Room of the White House, Washington, DC (AP Photo)

Obama-family

Barack Obama, as US President (l), is officially sworn-in for a second term by Chief Justice John Roberts (r, bottom), with first lady Michelle Obama holding the Robinson family Bible and daughters Malia and Sasha watching, Blue Room of the White House. (AP Photo)

Obama-public-oath

US President Barack Obama (l) receives the oath of office from Chief Justice John Roberts (bottom right) at the ceremonial swearing-in at 57th inauguration ceremony, US First Lady Michelle Obama holds Dr. Martin Luther King Jr. and Lincoln bibles as daughters Malia and Sasha look on, Washington DC (AP Photo)

Presidential-kiss

Michelle Obama (r), as US first lady, and Barack Obama (l), as US President, kiss during inaugural reception, 57th Presidential Inauguration, National Building Museum, Washington, DC (AP Photo)

Private-oath

Barack Obama, as US President (l), is officially sworn-in for a second term by Chief Justice John Roberts (r, bottom), with first lady Michelle Obama holding the Robinson family Bible and daughters Malia and Sasha watching, Blue Room of the White House. (AP Photo)

Public-oath

US President Barack Obama (l) receives the oath of office from Chief Justice John Roberts (bottom, c) during ceremonial swearing-in at US Presidential inauguration ceremony with US First Lady Michelle Obama (r) holding Dr. Martin Luther King Jr. and Lincoln bibles. (AP Photo)

Sasha-and-Malia-Obama

Sasha and Malia Obama (l-r) attend US Presidential Inauguration ceremony for their father US President Obama. (AP Photo)

Spectator-in-the-crowd

A spectator waiting on the National Mall in Washington, DC. (AP Photo)